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From "Shai Erera (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2555) Remove shared doc stores
Date Fri, 23 Jul 2010 11:09:49 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12891558#action_12891558
] 

Shai Erera commented on LUCENE-2555:
------------------------------------

What are the performance implications of removing shared doc stores? From what I understand,
if several segments share the same doc store, then when they are merged, the doc stores aren't
merged. Which is a great benefit, especially if you intend to store large fields.

I understand (mostly from the discussion on the PTDW) that with the move to a per-thread approach,
the doc stores cannot be shared between segments created by different threads, but what about
segments created by the same thread? Are we losing that functionality?

> Remove shared doc stores
> ------------------------
>
>                 Key: LUCENE-2555
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2555
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>            Reporter: Michael Busch
>            Assignee: Michael Busch
>            Priority: Minor
>             Fix For: Realtime Branch
>
>
> With per-thread DocumentsWriters sharing doc stores across segments doesn't make much
sense anymore.
> See also LUCENE-2324.

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